SDSS & GALEX databases SDSS: SkyServerhttp://www.sdss.org GALEX: GALEXViewhttp://galex.stsci.edu/GR4/

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Presentation transcript:

SDSS & GALEX databases SDSS: SkyServerhttp:// GALEX: GALEXViewhttp://galex.stsci.edu/GR4/

> 200 CVs so far SDSS at APO 2.5m 3.5m

SDSS camera: 30 CCDs 5 filters: u,g,r,i,z

QSO rejects Serendip Blue Cat_Var

SDSS fiber spectrograph

Typical CV spectra in DR1 CVs in DR1 in Szkody et al. 2003, AJ, 126, 1499 Strong lines Strong continuum Cyclotron humps Shows WD ZZ Cet Strong HeII Polar Polar

Possibilities with SkyServer: have fun with scrolling sky find mags of star + field objects find what field stars are [spectra] make a finding chart compare psf mags, fiber mags and DSS, GSC to determine variability

Available Data: DR7: 8420 sq deg imaging, 230 million objects; 1656 spectral plates, 640 spectra on each plate Stripe 82: 2.5 deg on CE from 22h24m to 4h08m RA; imaged Sept- Nov in , some back to 2002, 5-60 measurements with median of 10 observations for each object

GALEX NUV ( A) EF Eri 19.7in telescope with 1.2 deg diam FOV

GALEX Szkody, Harrison, Plotkin, Howell, Seibert, Bianchi, Ap, 646, L147, A A 5500A EF Eri

Possibilities with GALEX Find variables in wide field repeat obs identify their type Find UV brightness of your objects

NUV FUV

SDSS SkyServer things to look at: Tools (Scrolling sky) Visual Tools (Finding chart, Navigate, Explore) Help (Cooking with Sloan - Stars, SQL Tutorial)